Question

When I (a) ____________________ (returned, am returning, returns, 
should return) home yesterday , I ( b) ______________ ( sees, seen , saw, see )  that an old friend of mine ( c) __________________ ( am waiting , was waiting , waited  , waits ) for me . I (d) __________________________ (not seen, have not seen, had not seen, was not seen) him for the last ten years. 
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Answer 1

Answer:

a) returned

b) saw

c) was waiting

d) had not seen

Answer 2

Answer:

1. am returning
2. saw
3. was waiting
4. have not seen